The Player Piano and Musical Labor: The Ghost in the Machine by Allison Rebecca Wente
Wente's book explores the player piano, and the author is especially interested in issues of labor. The player piano is an important cultural object because it is an instrument of mechanical reproduction with attributes that lie much closer to the realities of industrial labor than does the far more commonly studied audio recording.
The author organizes the material effectively, starting with historical background on the player piano and then using the device to explore a number of topics.